Most time if you shift focus from full screen movie it will be better to come out full screen mode automatically. Here is a usecase where it is better to keep movie continue playing in full screen mode. I have a monitor connected to laptop, hence I should be able to work on some other application on laptop screen while the movie continuing in full screen on the big external monitor. So I would like disable automatically coming out from full screen mode, if full screen lost focus. Steps:- 1. Connect your laptop to an external monitor. 2. Open firefox on the external monitor. 3. Open another application (say, notepad) on laptops screen. 4. On firefox play a movie. 5. Goto full screen mode. 6. Now with mouse move focus to notpad. Result:- Movie playing in firefox comes out of full screen. Expected:- When user work on notepad movie should continue playing in the big screen on full screen mode.